Choosing the right intake manifold can unlock noticeable gains in horsepower, throttle response, and overall engine efficiency for GM LS engines. This guide highlights five high-performance 102mm intake options from FAST that are compatible with LS1, LS2, LS6, and related variants. Each section details key features, so you can compare how runners, materials, and bolt-on design affect performance across different LS architectures.
| Product | Brand | Compatibility | Highlights |
|---|---|---|---|
| FAST LSXr 102mm Intake Manifold for LS1/LS2/LS6 | FAST Store | LS1/LS2/LS6 cathedral ports | Longer runners, larger air inlet, black finish |
| FAST LSXr 102mm LS1/2/6 Intake Manifold + 102mm Big Mouth TB Kit | FAST Store | GM LS engines with LS1/LS2/LS6 heads | Interchangeable runners, heat-dissipating polymer TB kit |
| FAST LSXr 102mm Intake Manifold for LS3/L92 | FAST Store | LS3/L92 (rectangular port) heads | 102mm manifold, vehicle-specific fit |
| LSXr 102mm LS3/L92 Intake Manifold + 102mm Big Mouth TB Kit | FAST Store | GM LS with LS3/L92 heads | Big Mouth throttle body kit, improved airflow |
| 102MM Sheet Metal EFI Intake with Fuel Rails & TB | TEMSONE Store | LS family with cathedral ports | Fabricated aluminum, MAP port, complete EFI kit |
The following product details come from listed features and typical FAST 102mm offerings. Each option emphasizes improved airflow and tuning flexibility, suitable for performance-minded LS builds. When selecting, consider your engine head type (cathedral vs rectangular ports), desired throttle response, and how you plan to tune for peak power.
FAST LSXr 102mm Intake Manifold For LS1/LS2/LS6
This FAST LSXr manifold features longer runners and a larger air inlet compared to stock, delivering additional horsepower while preserving low-RPM torque. The black finish offers a striking appearance on any LS engine. Its modular, removable runner design enables easy disassembly and porting for tuning or porting work. This makes it a strong choice for engines targeting broader torque bands and higher airflow efficiency at high RPMs.
FAST LSXr 102mm LS1/2/6 Intake Manifold Kit
This kit pairs the Lexar intake with a 102mm Big Mouth Billet Throttle Body, designed for LS1/LS2/LS6 cathedral-port heads. It aims to enhance throttle response, torque, and overall airflow. The Lexar is renowned for consistent performance, with interchangeable runners to tune the power band. The kit emphasizes avoiding heat-prone sheet-metal alternatives by using advanced materials to reduce intake temperatures and improve engine efficiency.
FAST LSXr 102mm Intake Manifold For LS3/L92
This manifold targets LS3/L92 rectangular-port heads, offering a 102mm intake that aligns with performance goals for mid-to-high RPM ranges. It emphasizes fit-for-vehicle compatibility and is designed to work with specific vehicle configurations. The emphasis on a dedicated fit reduces installation complications and ensures optimized airflow for the intended head design.
LSXr 102mm LS3/L92 Intake Manifold Kit
This kit pairs the LSXr manifold with a Big Mouth Billet throttle body, designed for LS3/L92 heads. It focuses on improving throttle response, torque, and airflow with interchangeable runners to tailor the power band. The build recommends avoiding lower-efficiency sheet metal options in favor of polymer-based materials that help cool intake temps and boost engine efficiency.
102MM Sheet Metal EFI Intake With Fuel Rails
This sheet-metal EFI manifold is fabricated from T6061 aluminum, featuring a MAP port and compatibility with a broad range of GM LS heads with cathedral ports. It includes fuel rails and throttle position sensors, making it a complete EFI solution. The design prioritizes heat dissipation and efficient airflow, suitable for tuned LS builds that require precise fuel management and throttle control.
Buying Guide
Key purchase considerations when selecting a 102mm FAST intake manifold for LS engines:
- Head Type Compatibility: Cathedral-port vs rectangular-port heads determine which manifold fits best. Cathedral-port designs optimize lower-end torque, while rectangular-port configurations often target higher RPM horsepower.
- Runners and Air Inlet: Longer runners can improve mid-range torque; larger air inlets boost peak horsepower but may impact throttle response. Evaluate your target RPM range and driving goals.
- Materials and Heat Management: Polymer or advanced composites in throttle bodies and plastic components can reduce heat soak and improve airflow, but ensure耐久性 for daily driving or racing.
- Port Matching and Tuning: Interchangeable runners provide tuning flexibility, allowing you to tailor the power band. Porting work may be required for maximum gains.
- Fuel and EFI Integration: Some kits include EFI-ready features (MAP ports, fuel rails, TPS/IAC sensors). Confirm compatibility with your engine management system and fuel delivery setup.
- Installation and Fitment: Vehicle-specific fitment reduces installation complexity. Check mounting pattern compatibility with your cylinder head and intake flange.
- Cost vs Benefit: While 102mm manifolds offer airflow advantages, gains depend on supporting components (cam, exhaust, intake tuning). Consider the entire build when budgeting.
- Maintenance and Servicing: Removable runners and modular designs ease porting and maintenance, but ensure you have the right tools and expertise for disassembly.
Overall, these options provide a range of airflow enhancements, from practical, bolt-on improvements to fully tuned combinations with throttled performance in mind. When evaluating, align your choice with your engine’s head design, your tuning strategy, and your target operating range to maximize the benefits of a 102mm LS intake manifold.